Added tests for RegisterDomain, ListDomain and DescribeDomain

[abhishekj720]

What changed?
Tests:

• Register domain
• List domain
• describe domain

Why?
As part of test coverage week

How did you test it?
Unit test

Potential risks
Tests to avoid risk

Release notes
N.A.

Documentation Changes
Not required

[coveralls]

Pull Request Test Coverage Report for Build 018ebe8d-19ba-480d-b6de-a22689b9b54d

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 52 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.03%) to 67.248%

---

Files with Coverage Reduction	New Missed Lines	%
service/history/task/transfer_standby_task_executor.go	2	86.6%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
common/persistence/sql/sqlplugin/postgres/task.go	2	73.4%
common/persistence/sql/sqlplugin/postgres/db.go	2	80.0%
service/matching/db.go	2	73.23%
common/membership/hashring.go	2	82.23%
common/log/tag/tags.go	3	50.74%
service/history/queue/timer_gate.go	3	95.83%
service/history/task/task_util.go	4	75.14%
service/history/task/fetcher.go	4	85.05%

Totals
Change from base Build 018ebc81-3e94-4220-aba5-c4077acfd4fc:	0.03%
Covered Lines:	98048
Relevant Lines:	145801

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #5886 (50fd549) into master (88a4dea) will increase coverage by 0.14%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

see 8 files with indirect coverage changes

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